Grado SR 325i L-Cush - Test report a newbie-dummies Reference Audio Analyzer

Reports / Grado / SR 325i / L-Cush - report for a newbie

Grado SR 325i: L-Cush (report for a newbie)

General results Grado SR 325i L-Cush

  • Sensitivity by voltage: 118.33 dB/V SPL
  • Sensitivity by power: 103.68 dB/mW SPL
  • Average impedance : 34.24 ohm
  • The type of acoustic design: Open
  • Headphone: Low-impedance
  • Type of headphones: On-ear

Analysis with recommendations for Grado SR 325i L-Cush headphones based on the measured characteristics

Analysis and recommendations for Grado SR 325i L-Cush based on the measured characteristics
Sources
(to which the headphones will be connected)
Areas of using headphones Sensitivity Impedance The type of acoustic design Total
118.33 dB/V SPL 34.24 ohm Open  
Low-power sources -18dBV/6dB(mA), S/N 105 dB:

a smartphone
a player
a tablet
Examples
Home or studio, where sound from the headphones does not bother anyone 3
★★★☆☆
5
★★★★★
5
★★★★★
4.3
★★★★☆
Office and home, where people should not hear the sound from the headphones 3
★★★☆☆
5
★★★★★
1
★☆☆☆☆
3.0
★★★☆☆
Street with active traffic 2
★★☆☆☆
4
★★★★☆
5
★★★★★
3.7
★★★☆☆
Metro (subway), public transport 1
★☆☆☆☆
3
★★★☆☆
1
★☆☆☆☆
1.7
★☆☆☆☆
Mid-power sources 6dBV/30dB(mA), S/N 120 dB:
a computer with sound card
a Hi-Fi player
a portable amplifier
a mixer console
Examples
Home or studio, where sound from the headphones does not bother anyone 5
★★★★★
5
★★★★★
5
★★★★★
5.0
★★★★★
Metro (subway), public transport 5
★★★★★
5
★★★★★
1
★☆☆☆☆
3.7
★★★☆☆
Recording a voice or instrument in the studio 5
★★★★★
5
★★★★★
1
★☆☆☆☆
3.7
★★★☆☆
Hi-power sources 18dBV, S/N 120 dB:

a home system with a headphone amplifier
Examples
Home or studio, where sound from the headphones does not bother anyone 5
★★★★★
5
★★★★★
5
★★★★★
5.0
★★★★★
Office and home, where people should not hear the sound from the headphones 5
★★★★★
5
★★★★★
1
★☆☆☆☆
3.7
★★★☆☆




Analysis of acoustic design Grado SR 325i L-Cush

The Grado SR 325i headphones are made with an acoustic design of an open type.

Due to the open type, the headphones do not have noise isolation - the people around can hear well the music from the headphones, while you can hear ambient sounds too.

Headphones without noise isolation are well suited for home and studio in a quiet environment, as well as on the street with active traffic, allowing you to notice the danger in time.

Headphones without noise isolation are unsuitable for use in noisy public transport, as due to external noise it is necessary to increase the volume level of reproduced music, which is harmful for hearing during long listening. Loud sound is unpleasant to passengers nearby. In a studio, while recording vocals or instruments by a microphone, the open headphones are likewise not suitable, because sound from the "minus" from the headphones will gets into the microphone.





Analysis of the sensitivity of Grado SR 325i L-Cush headphones


The sensitivity of the Grado SR 325i headphones is 118.33 dB/V SPL by the voltage and 103.68 dB/mW SPL by the power. The sensitivity by voltage reflects the relative "loudness" of the headphones among others - the higher is the value, the louder are the headphones. The sensitivity by power reflects the efficiency of the headphones. High sensitivity of the headphones means less energy need from the source (for portable devices - less power from the battery).

Depending on the sensitivity, headphones are best to use with sources of optimum power. If the source is too powerful, then there is a high probability of constantly hearing background noise. If source power is weak, there will be insufficient volume level.

In a quiet environment for the Grado SR 325i, an amplifier with a voltage level of at least -8.33 dBV at 34 Ohms is recommended for listening to music with a level of 90 dB SPL (without noise isolation). An amplifier with a level above 29.67 dBV is not desirable if the volume control is digital, not analog.

For noisy environments, an amplifier with a voltage level of at least 3.67 dBV at a load of 34.24 ohms is desirable.


If you want to listen to music at a different volume level, you just need to add or subtract a change in dB to 90 dB SPL (for example, for a desired level of 105 dB SPL, add 15 dB and the minimum voltage level for the amplifier is -8.33 dBV + 15 dB = 6.67 dBV).






Analysis of the impedance of Grado SR 325i L-Cush headphones

The average resistance at the headphones Grado SR 325i is 34.24 Ohm.

The resistance affects the amount of current that the amplifier should give to the headphones. If the current is not enough, the sound quality will deteriorate, beginning with harsh in the sound and ending with a crackling. In most cases, at low current values, the amplifiers operate in comparable quality to class A, and as the current level rises, the quality decreases toward AB, B, and the clipping zone.

Imagine that you have a water tank, which gradually fills with water. The voltage from the amplifier this is the pressure with which the pump draws water from the reservoir. If the inflow of water in the tank is lower than the volume that the pump pumps out, then at the pump outlet we collect water and "bubbles". Similarly will be with the sound from the headphones, which are lacked the current from the amplifier.

For a quiet environment, an amplifier with an output current level of at least 11.19 mA in a given class of quality is desirable (preferably orientated to comparable class A) and 44.54 mA for loud.




Frequency response

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Sensitivity

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The average value of sensitivity by voltage for On-ear headphones by measured 169 models is 115.4 dB/V SPL.

The Grado SR 325i sensitivity is 118.3 dB/V SPL.

These headphones are 2.9 dB louder than most On-ear headphones.This difference is insignificant and not exceeding a threefold deviation from the mean. So, most devices designed to work with Over-ear headphones should fit quite well with the Grado SR 325i. A sufficient volume should be provided during playback and background noise from the source should not be noticeable.

In general, to listen to music with a level of 90 dB SPL in a quiet environment, the amplifier will require a voltage of -19.3 dBV.

It is desirable that the amplifier provides a margin of 12 dB in cases of rare noisy environments or for too quiet recordings. Thus, the amplifier should provide a maximum voltage level not lower than -7.3 dBV.

Excessive volume margin is undesirable, since for analog regulator, the adjustment range is about 40 dB and below that the channels imbalance begins. For a discrete regulator the pitch may be too large. For digital controllers are possible options for adjusting the sound level before a DAC or in a DAC. As a result of that will be decrease the signal-to-noise ratio and accordingly it is probable the appearance of audible noise.

The average sensitivity to power for On-ear headphones is 102.4 dB/mW SPL (average by measured 169 headphone models). The Audeze LCD-2C sensitivity is 103.7 dB / mW SPL. GradoSR 325i have just a little more sensitivity than other headphones of this type. This means that their power consumption is lower and being connected to mobile devices, the operation time of this bundle will be longer than of many others.

 

On-line comparison and selection services for Grado SR 325i

Comparison the frequency response.

Compare the frequency response of the bundles and AMPs.

Comparison of basic characteristics: Sensitivity, Impedance.

Determination of the required voltage level from a headphone amplifier for SR 325i and comparison with other models A additional analytics of compatibility with specific amplifiers.

Comparing changes in frequency and sound pressure as a function of the applied voltage and a impedance of an amplifier.

Headphone square wave comparison at the required frequency.

The automatic selection of the optimal AMP models from SR 325i.


Close

Measurements of Grado SR 325i L-Cush were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The Grado SR 325i L-Cush test was conducted as a black box test, without regard to cost and prestige. This is the basic principle for making measurements, measurement reports and developing tests in RAA.

I believe that it is important to do not make an absolute assessment of the device, but an aggregate assessment when working together with a source amplifier and taking into account external factors. This allows you to effectively reveal the potential of the entire set of devices or to make a more optimal choice of components.



SR 325i was given for tests by NEW COLISEUM






Kuznetsov Roman
Founder of RAA



Known by the nickname romanrex
Аuthor of articles iXBT.com



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Grado SR 325i is available in reports and services. You are in a simple report.

Information for entry level users

reports for a newbie (Headphones)
The automatic selection of the optimal AMP models
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Versus of characteristics



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